Giant rock crabs are massive versions of the weaker Rock crab. They lie in wait for prey, disguised as large boulders. When approached, they attack, unless they have become tolerant, in which case they remain as "boulders" - attempting to cast a spell on them gives the message "You can't attack this NPC."

Giant rock crabs are only initially aggressive if they are approached while dormant. Once they are moving and the targeted player is out of range, they stop being aggressive and will ignore players that don't attack them. They eventually become dormant boulders again after a while if they are not attacked.



The giant rock crab is one of few monsters in RuneScape that will retreat from battle when they become critically wounded. This can be troublesome, as they are found in a single-way combat area. This can be prevented by attacking them while their back is turned to a nearby wall, so that they move away from the player and back up into the wall. If they move too far away, the player will follow them and risk being attacked by another rock crab. There are several protruding sections of the walls in the area that can be used as safespots which are ideal as the crabs' main weakness is magic.



Item Quantity Rarity GE market price
Bones Bones 1 Always 72


Item Quantity Rarity GE market price
Water rune Water rune 1–39 Uncommon 5–195
Earth rune Earth rune 2–37 Uncommon 10–185
Air talisman Air talisman 1 Rare 68
Mind talisman Mind talisman 1 Rare 5,334
Fire talisman Fire talisman 1 Rare 5,903
Cosmic talisman Cosmic talisman 1 Rare 664
Body talisman Body talisman 1 Rare 650
Water talisman Water talisman 1 Rare 134
Earth talisman Earth talisman 1 Rare 289


Item Quantity Rarity GE market price
Steel platebody Steel platebody 1 Uncommon 879
Black claws Black claws 1 Uncommon 419
Black platebody Black platebody 1 Uncommon 3,832
Mithril axe Mithril axe 1 Uncommon 120
Rock-shell gloves Rock-shell gloves 1 Uncommon 423
Rock-shell boots Rock-shell boots 1 Uncommon 491
Black warhammer Black warhammer 1 Rare 327
Adamant longsword Adamant longsword 1 Rare 1,690
Adamant warhammer Adamant warhammer 1 Rare 2,158


Item Quantity Rarity GE market price
Poison ivy seed 5 Poison ivy seed 1 Uncommon 19
Belladonna seed 5 Belladonna seed 1 Uncommon 29
Herb seed 5 Guam seed 1 Uncommon 5
Herb seed 5 Marrentill seed 1 Uncommon 4
Herb seed 5 Tarromin seed 1 Uncommon 13
Herb seed 5 Harralander seed 1 Uncommon 19
Herb seed 5 Toadflax seed 1 Rare 672
Herb seed 5 Ranarr seed 1 Rare 41,016
Herb seed 5 Irit seed 1 Rare 49
Herb seed 5 Avantoe seed 1 Rare 595
Herb seed 5 Snapdragon seed 1 Rare 65,206
Herb seed 5 Cadantine seed 1 Rare 862
Herb seed 5 Lantadyme seed 1 Rare 1,712
Herb seed 5 Dwarf weed seed 1 Very rare 553
Herb seed 5 Torstol seed 1 Very rare 56,646


Item Quantity Rarity GE market price
Grimy guam leaf Grimy guam leaf 1 Uncommon 10
Grimy marrentill Grimy marrentill 1 Uncommon 10
Grimy tarromin Grimy tarromin 1 Uncommon 149
Grimy harralander Grimy harralander 1 Uncommon 677
Grimy ranarr weed Grimy ranarr weed 1 Rare 7,606
Grimy irit leaf Grimy irit leaf 1 Rare 882
Grimy avantoe Grimy avantoe 1 Rare 2,010
Grimy kwuarm Grimy kwuarm 1 Rare 1,286
Grimy cadantine Grimy cadantine 1 Rare 1,613
Grimy lantadyme Grimy lantadyme 1 Rare 1,535
Grimy dwarf weed Grimy dwarf weed 1 Rare 516


Item Quantity Rarity GE market price
Coins 100 Coins 27; 28; 42; 70; 137 Common Not sold
Raw lobster Raw lobster 1 Common 175
Raw bass Raw bass 1 Common 307
Tinderbox Tinderbox 1 Common 92
Rock-shell splinter Rock-shell splinter 1 Uncommon (1/64) 22,708
Rock-shell chunk Rock-shell chunk 1 Uncommon (1/64) 11,632
Rock-shell shard Rock-shell shard 1 Uncommon (1/64) 18,535
Casket Casket 1 Rare 993
Clue scroll (medium) Clue scroll (medium) 1 Very rare Not sold

Gem drop table

In addition to the drops above, this monster has access to the gem drop table.

Show/hide gem drop table
Item Quantity Rarity GE market price
Uncut sapphire Uncut sapphire 1 Rare 465
Uncut emerald Uncut emerald 1 Rare 672
Uncut ruby Uncut ruby 1 Rare 1,265
Nature talisman Nature talisman 1 Very rare 653
Uncut diamond Uncut diamond 1 Very rare 2,861
Rune javelin Rune javelin 5 Very rare 885
Loop half of key Loop half of key 1 Very rare 10,298
Tooth half of key Tooth half of key 1 Very rare 9,595
Rune spear Rune spear 1 Very rare 11,905
Shield left half Shield left half 1 Very rare 65,240
Dragon spear Dragon spear 1 Very rare 37,230
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